WorksheetsHES 101 MT2 review
Total questions: 40
Worksheet time: 20mins
What stores and releases Ca2+ ions?
t-tubules
sarcoplasmic reticulum
mitochondria
sarcoplasm
Which of the following is not a thin filament (select all that apply)
Myosin
Actin
Troponin
Tropomyosin
Titin
Which of the following happens during a muscle contraction?
A band shortens
I band widens
Zone of overlap decreases
H zone narrow
A band widens
What is the function of Schwann cells
act as phagocytes
Myelination of axons in PNS
formation of blood brain barrier
surround and support cell bodies
What keeps multiple muscle fascicles together?
Perimysium
Epimysium
Endomysium
Muscle fascia
What happens during repolarization?
Na+ leave the cell
Na+ enter the cell
K+ leave the cell
K+ enter the cell
What is a motor unit
All the motor neurons and all the muscle fibers they innervate
All the motor neurons and the 1 muscle fiber it innervates
1 motor neuron and all the muscle fibers it innervates
1 motor neuron and the 1 muscle fiber it innervates
How is the threshold reached to trigger an action potential?
one local potential
calcium
random depolarization
summation of local potentials
What structure contains synaptic vesicles full of ACh
Axon terminal
Synpatic cleft
Motor end plate
Motor neuron
How does the myelin sheath effect speed of propagation of action potentials
becomes slower
becomes faster
stays the same
they die out
what is the resting membrane potential of a muscle fiber
+30 mV
-20 mV
Which of the following is not found in the CNS
Satellite cell
Ependymal cell
Microglial cell
Astrocyte
What is the resting membrane potential of neurons?
-90mV
-70mV
-50mV
-30mV
What is a neurotransmitter
A chemical signal
A pressure signal
A voltage signal
A pain signal
What is a muscle fiber twitch?
The response of 1 muscle fascicle to a single action potential
The response of 1 isolated muscle fiber to a single action potential
All of the muscle fibers twitching in response to 1 action potential
A reflex
What is the overlap like between thin and thick filaments in a flexed wrist
not enough overlap
optimal overlap
no overlap
too much overlap
Time it takes for AP to propagate across the sarcolemma describes what?
Relaxation period
Contraction period
Latent period
Twitch period
Muscle fiber does not have any time to relax between stimuli describes what?
Unfused tetanus
Fused tetanus
Contracted tetanus
Isometric tetanus
Which of the following do we NOT need ATP for within muscle fiber
For ACh to be released
To pump Ca2+ back into SR
Crossbridge cycling
To power Na+/K+ active transport pump
Which of the following describes temporal summation?
Successive EPSPs
Fused tetanus
Multiple simultaneous EPSPs
Unfused tetanus
What describes pseudounipolar neurons
no dendrites, found in interneurons
one dendrite, found in interneurons
no dendrites, found in sensory neurons
one dendrite, found in sensory neurons
Function of microglial cells
formation of blood brain barrier
surround and support cell bodies
myelination of axons in CNS
act as phagocytes
What speeds up action potential propagation?
unmyelination
smaller axons
high resistance
larger axons
Which of the following is NOT a characteristic of multipolar neurons
two or more dendrites
highly branched dendrites
makes up motor neurons
has one dendrite
What energy system has sustained ATP generation?
Aerobic metabolism
Anaerobic metabolism
Creatine phosphate
ATP stores
How long can the creatine phosphate system supply max muscle activity
1 hour
2min
10-15s
5s
How much ATP is produced from 1 glucose molecule in anaerobic metabolism (glycolysis)
2
6
30
32
What does muscle fiber tension depend on?
Intensity of APs
Number of muscle fibers involved
Frequency of APs
Number of motor neurons involved
What is VO2max?
The maximum possible rate of oxygen use
The maximum possible rate of carbon dioxide production
The maximum rate of ATP production
The maximum rate of ATP use
What type of skeletal muscle fiber type has the fewest mitochondria and smallest blood supply?
Type 1
Type 11a
Type 11x
Type 111
What is muscle fatigue
Running out of energy
Lactate buildup
Inability of a muscle to maintain a given level of tension during activity
Running out of ATP
How does not using our muscle impact structure?
increase in force production
decreased blood supply
decreased diameter of muscle fiber
increased oxidative enzymes
Which system generates immediate ATP
Anaerobic metabolism
Aerobic metabolism
creatine phosphate
citric acid cycle
How does the myosin head become cocked during cross-bridge cycling?
ADP + P detaching
ATP hydrolysis
Ca2+
ATP binding
Which is a function of the sensory division?
carries stimuli to skeletal muscle
carriers stimuli to smooth muscle
Carries stimuli from organs to brain
performs functions of autonomic nervous system
What is the smallest functional unit of contraction
Sarcomere
Myofibril
Myofilament
Myosin
What does the somatic motor division do?
Carries sensory stimuli from muscles, bones, joints, skin
Carries stimuli from organs
Carries stimuli to skeletal muscles
Carries stimuli to smooth muscle, cardiac muscle, and glands
Where do action potentials generate?
Axon hillock
Axon collateral
Axon terminal
Dendrites
What is NOT apart of the central nervous system?
Spinal cord
Barin
Cranial nerves
How ready do you feel for this midterm?
Amazing, going to crush it
Pretty good
All I wanna do is pass
Not ready at all
